Comment développer la fraction svp 1/2×pie×((10-x)/2)au carré

Bonjour,

developper :

= 1/2 × π × [(10 - x)/2]²
= 1/2 × π × (5 - x/2)²
= 1/2 × π × (25 - 5x + x²/4)
= (25π/2) - (5πx)/2 + (πx²/8)